Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Vulnerability is the susceptibility to physical or emotional injury or attack. It also means to have one''s guard down, open to censure or criticism. Vulnerability refers to a person''s state of being liable to succumb, as to manipulation, persuasion or temptation. A window of vulnerability, sometimes abbreviated to wov, is a time frame within which defensive measures are reduced, compromised or lacking.